BenQ PE8700 service manual Appendix D HD2 Front Projection Image Quality Specification

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Appendix D HD2 Front Projection Image Quality Specification

1. SCOPE

This document specifies the image quality requirements applicable to the HD2 Component Set for Front Projection image display. The HD2 Component Set provides digital imaging functionality based on Digital Micromirror Device (DMD) technology.

2.DEFINITIONS 2.1 Blemish

A blemish is an obstruction (dark blemish), reflection, or refraction of light (light blemish) that is visible, but out of focus in the projected image under specified conditions of inspection (see Table 1). It is caused by a particle, scratch, or other artifact located in the image illumination path.

2.2 Dark pixel

A dark pixel is a single pixel or mirror that is non-functional (stuck) in the OFF position.

2.3 Bright pixel

A bright pixel is a single pixel or mirror that is non-functional (stuck) in the ON position.

2.4 Unstable pixel

An unstable pixel is a single pixel or mirror that does not operate in sequence with parameters loaded into memory. The unstable pixel appears to be flickering asynchronously with the image.

2.5 Adjacent pixels

Adjacent pixels are defined as sharing a common border or common point.

2.6 Border defects

Border defects are bright blemishes (see 2.1) or bright pixel defects (see 2.3) in the non-active area that may be visible in front projection mode.

2.7 Blue test screen

This screen is used to test for major dark blemishes and dark pixels. All areas of the screen are colored at a specific blue level, based on MS Paint 0-255 RGB scale:

Major Dark Blemish

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